Introduction to complex numbers

Learn about complex numbers and how to add, subtract, and multiply them. This will come in useful when working with polynomials.
9 exercises available

Learn about complex numbers (spoiler: they are numbers that consist of both real and imaginary parts).

Learn how we can visualize complex numbers in a plane. This can be seen as an expansion of the 1-dimensional real number line into a 2-dimensional plane!

Learn how to multiply complex numbers using the fact that i^2=-1 and the distributive property. For example, multiply (1+i) by (2+3i).